Hi. Great question.
First, you obviously have the right to only participate in sexual activities that you wish to. However, let me say that growth only happens when we leave our comfort zone. This may be a great opportunity for you to expand your comfort zone and try something new.
Half of having good sexual experiences is being comfortable in your own skin. The reality is that most of us don't look look like Brad and Angelina, and we don't have to to have good relationships and good sexual experiences. Your boyfriend accepts that. He obviously finds your body exciting, or he wouldn't want to do these things with you.
Why not try moving on top while wrapping the covers around your shoulders? That could help you become more comfortable easing into different activities. It can't hurt and it could be a great opportunity to expand your boundaries.
From a man's perspective, having the woman on top is a mind-blowing experience. From a therapists perspective, many women are more likely to have an orgasm when on top because they can control the level and type of stimulation to their clitoris. I can also tell you that a woman being comfortable with herself and with you means much more than being perfectly trim and toned.
As you become more comfortable with yourself, I think you will be amazed at the way relationships can open up. I suspect you've formed an opinion about how he sees your body. We call that "Mind reading" and "Jumping to conclusions." I bet thinking about doing these things with you drives him crazy.
I hope you let us know what happens.
